Power battery variable-frequency heating method and device and electric vehicle

A power battery and heating method technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of reduced battery heating effect, small AC signal current amplitude, etc., to achieve increased current amplitude, Effect of increasing heating efficiency

Active Publication Date: 2020-12-29
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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AI Technical Summary

Problems solved by technology

[0004] In related technologies, when calculating the model, based on the impedance of the full battery, the current amplitude of the AC signal will be relatively small, resulting in a reduction in the heating effect of the battery

Method used

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Embodiment Construction

[0059]In the following description, references to "some embodiments" describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or a different subset of all possible embodiments, and Can be combined with each other without conflict.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0061] In the related art, when using alternating current to heat the battery, the impedance of the battery is used to calculate the magnitude of the alternating current. However, in the related art, the magnitude of the heating current is based on the impedance of the full battery, including the inductive reactance of the indu...

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Abstract

The invention discloses a power battery variable frequency heating method and device and an electric vehicle, and relates to the battery technology, and the method comprises the following steps: obtaining a first current amplitude according to the ratio of the difference between an upper limit voltage and an open-circuit voltage of equipment to the minimum impedance; taking the smaller one of thedifference between the open-circuit voltage and the lower limit value of the safety voltage and the difference between the upper limit value of the safety voltage and the open-circuit voltage as minimum polarization voltage; obtaining charge transfer impedance when the alternating-current frequency is an upper limit value of the alternating-current frequency according to the temperature of the battery and the impedance model; obtaining a second current amplitude according to the ratio of the minimum polarization voltage to the charge transfer impedance; selecting a smallest value from the upper limit current amplitude, the first current amplitude and the second current amplitude of the equipment as a target alternating-current amplitude; and determining a target alternating-current frequency according to the target alternating-current amplitude, and configuring alternating current. The impedance of the non-chemical active part can be removed when the alternating current amplitude is calculated, the calculation result is increased, and the heating efficiency is improved.

Description

technical field [0001] The invention relates to battery technology, in particular to a power battery frequency conversion heating method, device and electric vehicle. Background technique [0002] Since lithium-ion batteries store and release energy through electrochemical reactions, when the temperature is very low, the electrochemical reaction rate decreases and ion migration is slow, which is a great challenge to the energy storage and release of lithium-ion batteries. The current relatively common solution is to design an auxiliary system for heating the battery in the thermal management solution. There are two types of battery heating technologies commonly used, one relies on an external heat source to conduct heat to the inside of the battery, and the other relies on the Joule heating effect of the internal resistance of the battery to directly heat from the inside. [0003] Compared with external heating methods such as relying on electric heaters or heat pump heatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/637H01M10/48H01M10/42
CPCH01M10/615H01M10/625H01M10/637H01M10/486H01M10/425Y02E60/10
Inventor 方杰刘华涛张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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